Roofing Squares Calculator

Enter your roof's footprint and pitch. See how many squares and bundles of shingles you need — waste included. Free, no signup.

Roof footprint length (ft) Roof footprint width (ft) Roof pitch (slope) Waste factor (%)

Squares needed (with waste)

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Actual roof area—

Bundles of shingles (3 per square)—

Rolls of underlayment (10 sq each)—

Build the full estimate & bid

The Roofing Estimate & Job Cost Calculator turns squares into a priced material list, labor, and a profitable bid — Excel & Google Sheets.

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What is a "square" in roofing?

One roofing square = 100 square feet of roof surface. Roofers order materials by the square. To get your squares, multiply the roof's actual (sloped) area by your pitch factor, divide by 100, then add waste for cuts, hips, and valleys.

How many bundles of shingles per square?

Standard 3-tab and architectural shingles come 3 bundles per square. So a 25-square roof needs about 75 bundles, plus extra for waste. Always round up and buy a little extra.

Estimates for planning only. Verify with your supplier and local code.

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